They were born in General Jackrabbit's laboratory inside his ship, using DNA from three dinosaurs skulls (Pterodactyl, Triceratops and Tyrannosaurus Rex) and clipping of hair from the General's fluffy tail. The Cloning Machine pop out three eggs and they hatch the Jurassic Jackrabbits (Rabbidactyl, Triharetop and Bunnysaurus Rex), the General throw them out his spaceship and use his Meany Machine to grow dinosaur-sized to destroy the city of Squeakyville.